(19)
(11) EP 0 156 130 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.07.1986 Bulletin 1986/31

(43) Date of publication A2:
02.10.1985 Bulletin 1985/40

(21) Application number: 85101239

(22) Date of filing: 06.02.1985
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 07.02.1984 NL 8400374

(71) Applicant: STAMICARBON B.V.
 ()

(72) Inventor:
  • van der Molen, Theodorus Jacobus
     ()

   


(54) Process for the preparation of blown film and oriented film


(57) Blown film on the basis of low-density polyethylene is prepared by extruding the molten polymer at melt temperatures at the die gap of below 135°C. Films that have been prepared this way have special orientation as a result of which good mechanical and optical properties are present. Oriented films are determined by X-ray diffraction analysis and have an intensity ratio of the 110 reflection band max./min. of at least 20, and an angle a between the average orientation direction of the polymer molecules and the film extrustion direction of at most 20°.







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